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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: May 2016 Posts: 56 Wrench Fetcher | | Wrench Fetcher Joined: May 2016 Posts: 56 | on my 1948 6400 , I installed a new master cylinder. When I let off the brake petal, the brakes won't completely release. I loosened the brake line coming out of the master cylinder . That relieved the pressure, brakes were free. . So I removed the little valve inside the master cylinder . didn't help. Brakes only reliese when I bleed the line coming out the master cylinder. now what?
I just finished a 1946 chevy pickup street rod
now on a 1950 chevy 3100
.
also a GMC 220 with duals
and a 1948 chevy 2 ton
| | | | | Joined: Feb 2011 Posts: 1,363 'Bolter | | 'Bolter Joined: Feb 2011 Posts: 1,363 | Must be a bad new master cylinder. Its like there is a check valve in that outlet holding the pressure.
Kicking self for selling off my Taskforce trucks.
Still looking for an LCF or conventional big bolt in decent shape.
As of 10-26-2022, A 55.2 Taskforce long bed now the work begins
| | | | | Joined: Mar 2019 Posts: 1,003 'Bolter | | 'Bolter Joined: Mar 2019 Posts: 1,003 | I would also think M/C is at fault.. | | | | | Joined: May 2017 Posts: 330 'Bolter | | 'Bolter Joined: May 2017 Posts: 330 | Shorten the master cylinder push rod, until the piston can move back far enough to clear the bleed hole in the bottom of the resevour. If the rod is too long, exactly what you describe happens. There should be a small fountian of brake fluid in the master when the pedal is pushed. Pressure in the master needs somewhere to go when the pedal is released, the bleed hole provides that and allows fluid into the master to compensate for shoe wear.
Mac :{)
1962 K10 short step side, much modified for rally
1969 T50 fire truck, almost nos, needs a few things
| | | | | Joined: May 2016 Posts: 56 Wrench Fetcher | | Wrench Fetcher Joined: May 2016 Posts: 56 |
I just finished a 1946 chevy pickup street rod
now on a 1950 chevy 3100
.
also a GMC 220 with duals
and a 1948 chevy 2 ton
| | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy Charles Pretzer, in addition to adjusting the pushrod to the correct length so the master cylinder piston can return to its at rest position I would strongly recommend reinstalling the residual pressure valve you removed from your master cylinder, that will allow the hydraulic system to operate as it was designed to, hope that helps. | | | | | Joined: May 2016 Posts: 56 Wrench Fetcher | | Wrench Fetcher Joined: May 2016 Posts: 56 | Thanks to all. adjusted pushrod, that fixed the problem . I'll reinstall the valve this P.M.
I just finished a 1946 chevy pickup street rod
now on a 1950 chevy 3100
.
also a GMC 220 with duals
and a 1948 chevy 2 ton
| | | | | Joined: May 2017 Posts: 330 'Bolter | | 'Bolter Joined: May 2017 Posts: 330 | Sorry, I forgot you had pulled that valve out, yes for sure reinstall it.
Mac :{)
1962 K10 short step side, much modified for rally
1969 T50 fire truck, almost nos, needs a few things
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